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Re: Antisurge/Ported Shrouds

Look at the location - you're not in the 'pressurized' portion of the intake - you're just inside the inlet where compression begins.

Tissimo, you've got back to back runs to show this?

There are several runs on SF where non surge covers make more power. If you think about it it makes perfect sense, the turbo can only flow so much, if you induce a leak (surge port) the air will leak through there and less flow reaches the engine.

Re: Antisurge/Ported Shrouds

in response to the video:
i don't understand it. what are they doing throttle wise just to make it surge like that? They said they closed the bovs to ensure that they were not a factor, but that in itself is the factor to me. If the excess air cannot be released then of course its going to surge like that.. i'm so lost.

Re: Antisurge/Ported Shrouds

Originally Posted by Supra_Villan

in response to the video:
i don't understand it. what are they doing throttle wise just to make it surge like that? They said they closed the bovs to ensure that they were not a factor, but that in itself is the factor to me. If the excess air cannot be released then of course its going to surge like that.. i'm so lost.

It's really simple man...don't over analize it! That particular turbo is pumping more air then the motor wants...therefor the pressure wants to excape and it only has two places to go....either the motor takes it or the air backs up and forces itself back out the turbo....

The other type of surge is when the throttle closes and all that fast moving air and pressure bounces back and reverses travel towards the turbo....which is why gas motors have bypass valves, blow off valves, and or some crazy badass shit antilag system that routs that air into the exhaust mani....

The ported shrouds let you force even more air in as it has en escape route for air....the turbo sucks it back in ofcourse as to not create a boost leak.